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CO2 Inflator Bicycle Tire Pump For Presta and Schrader Valves - Works With All Bike Tires - Hybrid, Road and Mountain Bikes - No Need To Carry That Awkward Hand Tire Pump That Takes Up Space And Takes Forever To Inflate The Tube. Works With 12, 16, 20 Gram Threaded Cartridges. CO2 Cartridges Are NOT Included.